On Sat, Oct 9, 2010 at 11:25, Matt Ettus <m...@ettus.com> wrote: > On 10/08/2010 07:10 PM, Mark J. Blair wrote: >> >> On Sep 25, 2010, at 10:41 AM, dburg...@kestrelsp.com wrote: >>> >>> We would have used 13 MHz, but the USRP-1 FPGA code fails to transmit for >>> clock rates below about 48 MHz. >> >> Does anybody know why this is? >> > > That is not correct. The inband signaling code that OpenBTS uses may not > work with those clock rates, but the standard code we developed works just > fine with any clock frequency. I have used it all the way down to 10 MHz.
I believe that it's still doesn't work as expected at low clock rates. While FPGA code may support this, ADC or DAC (don't recall exactly) need a different configuration of capacitors/resistors - USRP use default configuration from the datasheet, which is suitable for high clock rates. That's from my memories, so I may be wrong somewhere. -- Regards, Alexander Chemeris. http://www.fairwaves.ru _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
